Boundary conditions
 

dear all,,

I'm looking for suggestions in specifying boundary conditions.

I have a cube-like structure and an inlet (mass-flow inlet). I have UDF for mass flow inlet (from 0.00014kg/sec to 0kg/sec), where the flow suppresses after 5 sec. I have to check the movement of air inside the cube for 50 seconds.

The operating pressure is set to 101325Pa.
Gas behavior: ideal gas
Operating density to zero
gravity in y axiy

In this case, should I specify the other end of the cube as an outlet? If so, what should be the condition: (pressure outlet or mass flow outlet)?